Tread portion of an automobile tire



FIG. 1 is a perspective view of the top, front and right side of a tread portion of an automobile tire, it being understood that the tread pattern repeats uniformly throughout the circumference of the tire, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is an enlarged front elevational view thereof; and,

FIG. 7 is an enlarged cross-sectional view thereof taken along the line 7—7 in FIG. 6.

The broken lines in the drawings represent environmental structure only and form no part of the claimed design. 

The ornamental design for a tread portion of an automobile tire, as shown and described. 